A polymer that irreversibly cures to its finished state through a catalytic reaction. Unlike thermoplastic foam, a thermoset foam cannot be melted. Polyurethane spray foam and polyisocyanurate board foam are examples of thermoset materials.

SPFA believes that the path to a healthful, safe, high-quality and performing SPF installation travels through the hands of a knowledgeable, trained, experienced, and ideally PCP-certified professional contractor.